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| Format: | Preprint |
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2025
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| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2508.20215 |
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| _version_ | 1866915467652759552 |
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| author | Graykowski, Ariel Langin, Guillaume Chiron, David Guillet, Bruno Marchis, Franck Biver, Nicolas Arlic, Gérard Baudouin, Bernard Bertrand, Etienne Blake, Randall Bosquet, Cyrille Bradley, John K. Brocard, Isabelle Cac, Christophe Cagna, Alain Castel, Nicolas Chariot, Eric Clerget, Olivier Coarrase, Tom Cogniaux, Lucas Collot, Julien Coté, Christophe Deconinck, Michel Desgrees, Jean-Paul Desmars, Josselin Di Tommaso, Giuseppe Donas, José Drapeaud, William Forrester, Todd Frémont, Florent Fukui, Keiichi Garde, Paul Gaudilliere, Jérôme Gaudin, Pascal Giacomoni, Alexis Gineste, David Girard, Patrice Gomez, Jean Claude Goodman, Chuck Grandjean, Gerard-Philippe Guiglion, Philippe Havell, David Huth, Patrick Iwai, Kachi Julien, Marc-Etienne Knight, Rachel Kukita, Ryuichi Kuossari, Petri Ladruze, Jean-Michel Lassoued, Anis Ben Latgé, Cédric Laugier, Jean-Marie Lauvernier, Matthieu Guen, Patrice Le Tarnec, Jean-Charles Le Lefoulon, Didier Leroux, Liouba Leroux, Niniane Leroy, Arnaud Logan, Chelsey Lorand, Yohann Maris, Elisabeth Masini, Jean-Pierre Meneghelli, Nicola Millart, Laurent Miny, Eric Mitchell, Mike Montoya, Baptiste Mortecrette, Fabrice Nardi, Anouchka Ngo, Antoine Nicolas, Denis Nicollerat, Raphael Okada, Takaya Ono, Wataru Patatoukas, George Payet-Ayrault, Jacqueline Picard, Patrick Porchel, Claude Potts, Kanai Quienen, Michel Relier, Martial Richardot, Fabien Rivett, Darren Ryno, Matthew Saibi, Fadi Saibi, Sophie Sartini, Christian Sasaki, Hiromichi Seibert, Philippe Shimizu, Masao Sifoni, Lucas Simard, Georges Tikkanen, Petri Transom, Ian Tregon, Bernard Tyrlik, Frank Vadrot, Laurent Veuillet, Michel Voirol, Christian Will, Stefan Yahia, Corine Yehle, Phil Yoblonsky, Neil Yue, Wai-Chun |
| author_facet | Graykowski, Ariel Langin, Guillaume Chiron, David Guillet, Bruno Marchis, Franck Biver, Nicolas Arlic, Gérard Baudouin, Bernard Bertrand, Etienne Blake, Randall Bosquet, Cyrille Bradley, John K. Brocard, Isabelle Cac, Christophe Cagna, Alain Castel, Nicolas Chariot, Eric Clerget, Olivier Coarrase, Tom Cogniaux, Lucas Collot, Julien Coté, Christophe Deconinck, Michel Desgrees, Jean-Paul Desmars, Josselin Di Tommaso, Giuseppe Donas, José Drapeaud, William Forrester, Todd Frémont, Florent Fukui, Keiichi Garde, Paul Gaudilliere, Jérôme Gaudin, Pascal Giacomoni, Alexis Gineste, David Girard, Patrice Gomez, Jean Claude Goodman, Chuck Grandjean, Gerard-Philippe Guiglion, Philippe Havell, David Huth, Patrick Iwai, Kachi Julien, Marc-Etienne Knight, Rachel Kukita, Ryuichi Kuossari, Petri Ladruze, Jean-Michel Lassoued, Anis Ben Latgé, Cédric Laugier, Jean-Marie Lauvernier, Matthieu Guen, Patrice Le Tarnec, Jean-Charles Le Lefoulon, Didier Leroux, Liouba Leroux, Niniane Leroy, Arnaud Logan, Chelsey Lorand, Yohann Maris, Elisabeth Masini, Jean-Pierre Meneghelli, Nicola Millart, Laurent Miny, Eric Mitchell, Mike Montoya, Baptiste Mortecrette, Fabrice Nardi, Anouchka Ngo, Antoine Nicolas, Denis Nicollerat, Raphael Okada, Takaya Ono, Wataru Patatoukas, George Payet-Ayrault, Jacqueline Picard, Patrick Porchel, Claude Potts, Kanai Quienen, Michel Relier, Martial Richardot, Fabien Rivett, Darren Ryno, Matthew Saibi, Fadi Saibi, Sophie Sartini, Christian Sasaki, Hiromichi Seibert, Philippe Shimizu, Masao Sifoni, Lucas Simard, Georges Tikkanen, Petri Transom, Ian Tregon, Bernard Tyrlik, Frank Vadrot, Laurent Veuillet, Michel Voirol, Christian Will, Stefan Yahia, Corine Yehle, Phil Yoblonsky, Neil Yue, Wai-Chun |
| contents | We report photometric observations of Comet 103P/Hartley 2 during its 2023 apparition. Our campaign, conducted from August through December 2023, combined data from a global network of citizen astronomers coordinated by Unistellar and the Association Française d'Astronomie. Photometry was derived using an automated pipeline for eVscope observations in partnership with the SETI Institute and aperture photometry via AstroLab Stellar. We find that the comet's peak reduced brightness, measured at $G_{\rm min} = 10.24 \pm 0.47$, continues a long-term fading trend since 1991. The decline in activity follows a per-apparition minimum magnitude increase of $ΔG_{\rm min} = 0.59 \pm 0.11$ mag, corresponding to an approximately $42\%$ reduction in brightness each return. This trend implies that the comet's active fraction has declined by about an order of magnitude since 1991 and may indicate that Hartley 2 is no longer hyperactive by definition. The fading is consistent with progressive volatile depletion rather than orbital effects. These results offer insight into the evolutionary processes shaping Jupiter-family comets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20215 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Ongoing Decline in Activity of Comet 103P/Hartley 2 Graykowski, Ariel Langin, Guillaume Chiron, David Guillet, Bruno Marchis, Franck Biver, Nicolas Arlic, Gérard Baudouin, Bernard Bertrand, Etienne Blake, Randall Bosquet, Cyrille Bradley, John K. Brocard, Isabelle Cac, Christophe Cagna, Alain Castel, Nicolas Chariot, Eric Clerget, Olivier Coarrase, Tom Cogniaux, Lucas Collot, Julien Coté, Christophe Deconinck, Michel Desgrees, Jean-Paul Desmars, Josselin Di Tommaso, Giuseppe Donas, José Drapeaud, William Forrester, Todd Frémont, Florent Fukui, Keiichi Garde, Paul Gaudilliere, Jérôme Gaudin, Pascal Giacomoni, Alexis Gineste, David Girard, Patrice Gomez, Jean Claude Goodman, Chuck Grandjean, Gerard-Philippe Guiglion, Philippe Havell, David Huth, Patrick Iwai, Kachi Julien, Marc-Etienne Knight, Rachel Kukita, Ryuichi Kuossari, Petri Ladruze, Jean-Michel Lassoued, Anis Ben Latgé, Cédric Laugier, Jean-Marie Lauvernier, Matthieu Guen, Patrice Le Tarnec, Jean-Charles Le Lefoulon, Didier Leroux, Liouba Leroux, Niniane Leroy, Arnaud Logan, Chelsey Lorand, Yohann Maris, Elisabeth Masini, Jean-Pierre Meneghelli, Nicola Millart, Laurent Miny, Eric Mitchell, Mike Montoya, Baptiste Mortecrette, Fabrice Nardi, Anouchka Ngo, Antoine Nicolas, Denis Nicollerat, Raphael Okada, Takaya Ono, Wataru Patatoukas, George Payet-Ayrault, Jacqueline Picard, Patrick Porchel, Claude Potts, Kanai Quienen, Michel Relier, Martial Richardot, Fabien Rivett, Darren Ryno, Matthew Saibi, Fadi Saibi, Sophie Sartini, Christian Sasaki, Hiromichi Seibert, Philippe Shimizu, Masao Sifoni, Lucas Simard, Georges Tikkanen, Petri Transom, Ian Tregon, Bernard Tyrlik, Frank Vadrot, Laurent Veuillet, Michel Voirol, Christian Will, Stefan Yahia, Corine Yehle, Phil Yoblonsky, Neil Yue, Wai-Chun Earth and Planetary Astrophysics We report photometric observations of Comet 103P/Hartley 2 during its 2023 apparition. Our campaign, conducted from August through December 2023, combined data from a global network of citizen astronomers coordinated by Unistellar and the Association Française d'Astronomie. Photometry was derived using an automated pipeline for eVscope observations in partnership with the SETI Institute and aperture photometry via AstroLab Stellar. We find that the comet's peak reduced brightness, measured at $G_{\rm min} = 10.24 \pm 0.47$, continues a long-term fading trend since 1991. The decline in activity follows a per-apparition minimum magnitude increase of $ΔG_{\rm min} = 0.59 \pm 0.11$ mag, corresponding to an approximately $42\%$ reduction in brightness each return. This trend implies that the comet's active fraction has declined by about an order of magnitude since 1991 and may indicate that Hartley 2 is no longer hyperactive by definition. The fading is consistent with progressive volatile depletion rather than orbital effects. These results offer insight into the evolutionary processes shaping Jupiter-family comets. |
| title | The Ongoing Decline in Activity of Comet 103P/Hartley 2 |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2508.20215 |